Why can’t you just inject serotonin to feel happy?

Question

Why can’t you just inject serotonin to feel happy?

In: 91

Answer 1

For various reasons.

First serotonin has other jobs in the body too, so you’ll get some sideeffects. (Mainly it regulates blood pressure and clotting)

Then it wouldn’t last long, your body compensates chemicals coming from the outside by producing less of them instead, and when you supply them constantly your receptors will get duller so you build up a tolerance.

You basically just invented heroin 2.0